I eat a plant-based diet and still enjoy lifting heavy weights frequently throughout the week so my creatine levels suffer if I don't take this. I'm not saying you need creatine to workout if you're vegan/strict vegetarian, but you probably will if you engage in high-intensity exercises routinely that require and also deplete your creatine levels. I definitely don't take the recommended dosage, though. Taking 1 pill with two to three meals a day (usually 1 or none over my breaks) is plenty for me.
If you're not plant-based then this product probably won't do anything for you other than make you *think* it's working - you have to be "deficient" in creatine to feels the effects.